1.Payment is through ABE or by check or money order. Payment must accompany order. Institutions may receive deferred billing upon request. Our answering machine is always available to accept messages. Remember to speak clearly. 2.Nevada residents must remit the appropriate sales tax for their area. 3.Telephone orders gladly accepted. Answering machine is available when I am not at home. Books will be held for 10 days. Payment must reach me by that time.